In the early 19th century the only type of electricity that people knew it was static electricity. The ancient Greeks had no idea of ​​the electric charges, but they worked out (accumulated) static electricity by friction of various substances of different nature (amber, hair, etc.) together. They did not think then that you can use electricity for lighting and power machines. One of the people who was able to find a connection between static electricity and electrical shock, the US government has been activist, scientist and inventor Benjamin Franklin. In 1752, Franklin, trying to figure out the mysteries of electricity, fly a kite in a thunderstorm, it was not safe. It was designed to catch the lightning electricity.

In order to record information represented as the forces of electric charges using the mathematical vector field, which is depicted in the space in the form of power lines of two types. One kind is the equipotential lines, that is formed by equal values ​​of potential (voltage), and the other type is called the power lines. These field lines intersect the equipotential and scales are the value of forces in the points in space. To build a picture of the electric field is used to compute the value of the electric field. The voltage value is the base, in order to describe the interaction of charges through the presentation of the electric field.